2,5-Dioxopyrrolidin-1-yl 3-(3-(2,5-dioxo-2,5-dihydro-1H-pyrrol-1-yl)propanamido)propanoate represents a heterobifunctional PEG linker, featuring a terminal NHS ester that can be used to label amine compounds and maleimide group for reactions with thiol groups.
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